$\int\sen36\cos^{3}\thetad\theta$

$\left(x-2\right)^2-\left(x^2-4x-4\right)^2-4x\left(x-4\right)-12x^2$

$\left(x^2-5x+1\right)\cdot\left(2x-3\right)$

$\int_{-a}^a\left(\frac{1}{x^2+a^2}\right)dx$

$2xy^35x^2y^2$

$49x^2-10x+81$

$\cos^2\left(2a\right)-2\sin\left(2a\right)+2$